Update README.md

README.md

@@ -48,6 +48,8 @@ This package file includes a launch file named spawn_sign.launch which is intend
     * stop
     * unmarked_intersection
     * ahead_only
+    * turn_left
+    * turn_right
 * **x** (default=0.0) x position where the traffic sign will placed in the simulated environment with respect to the parent frame.
 * **y** (default=0.0) y position where the traffic sign will placed in the simulated environment with respect to the parent frame.
 * **yaw** (default=0.0) orientation of the traffic sign with respect to the parent frame.